The present research addresses the application of state-of-the-art algorithms to estimate the effect of block loading at R - -1 upon constant crack growth rate considering the A1N mild steel, which is widely used for manufacturing railway axles. The obtained results can be so summarized: crack propagation curves obtained at constant amplitude loading by traditional small-scale fracture mechanics specimens show a significant scale effect in respect to those coming from full-scale tests on railway axles; two novel small-scale companion specimens, characterized by higher constraint at the crack tip, were successfully designed in order to reduce this scale effect. Moreover, the modified C(T) specimen is able to be tested at negative stress ratios; considering the application of suitably calibrated SY models to prediction of constant amplitude loading tests, the NASGRO software package resulted to perform better than the others when the ID tabular look-up is adopted to provide material's data; a very simple no interaction model permitted to predict, in an effective way, crack propagation curves obtained by the application of HI-LOW block loads and a discretized load spectrum better than using the more sophisticated SY model.
Analysis of crack growth at R=-1 under variable amplitude loading on a steel for railway axles
Analyse des Risswachstums bei R = -1 unter Belastung mit variabler Amplitude an einem Stahl für Eisenbahnachsen
2009
18 Seiten, 11 Bilder, 1 Tabelle, 34 Quellen
Conference paper
English
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